adamdebreceni commented on a change in pull request #875:
URL: https://github.com/apache/nifi-minifi-cpp/pull/875#discussion_r476344817
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File path: libminifi/include/utils/OptionalUtils.h
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@@ -37,11 +39,47 @@ optional<typename gsl_lite::remove_cvref<T>::type>
optional_from_ptr(T&& obj) {
return obj == nullptr ? nullopt : optional<typename
gsl_lite::remove_cvref<T>::type>{ std::forward<T>(obj) };
}
+template<typename>
+struct is_optional : std::false_type {};
+
+template<typename T>
+struct is_optional<optional<T>> : std::true_type {};
+
} // namespace utils
} // namespace minifi
} // namespace nifi
} // namespace apache
} // namespace org
+namespace nonstd {
+namespace optional_lite {
+
+namespace minifiutils = org::apache::nifi::minifi::utils;
+
+// map
+template<typename SourceType, typename F>
+auto operator|(const optional<SourceType>& o, F&& f)
noexcept(noexcept(minifiutils::invoke(std::forward<F>(f), *o)))
+ -> optional<typename
std::decay<decltype(minifiutils::invoke(std::forward<F>(f), *o))>::type> {
+ if (o.has_value()) {
+ return make_optional(minifiutils::invoke(std::forward<F>(f), *o));
+ } else {
+ return nullopt;
+ }
+}
+
+// bind
+template<typename SourceType, typename F>
+auto operator>>=(const optional<SourceType>& o, F&& f)
noexcept(noexcept(minifiutils::invoke(std::forward<F>(f), *o)))
Review comment:
yes, that could work
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